text: # -*- coding: utf-8 -*-
  """The app module, containing the app factory function."""
  from flask import Flask, render_template
  
  from chatapp import commands, public, user
  from chatapp.extensions import bcrypt, cache, csrf_protect, db, debug_toolbar, login_manager, migrate, webpack, oauth
  
  
  def create_app(config_object='chatapp.settings'):
      """An application factory, as explained here: http://flask.pocoo.org/docs/patterns/appfactories/.
  
      :param config_object: The configuration object to use.
      """
      app = Flask(__name__.split('.')[0])
      app.config.from_object(config_object)
      register_extensions(app)
      register_blueprints(app)
      register_errorhandlers(app)
      register_shellcontext(app)
      register_commands(app)
      return app
  
  
  def register_extensions(app):
      """Register Flask extensions."""
      bcrypt.init_app(app)
      cache.init_app(app)
      db.init_app(app)
      oauth.init_app(app)
      csrf_protect.init_app(app)
      login_manager.init_app(app)
      debug_toolbar.init_app(app)
      migrate.init_app(app, db)
      webpack.init_app(app)
      return None
  
  
  def register_blueprints(app):
      """Register Flask blueprints."""
      app.register_blueprint(public.views.blueprint)
      app.register_blueprint(public.views.github_bp, url_prefix='/github')
      app.register_blueprint(public.views.google_bp, url_prefix='/google')
      app.register_blueprint(user.views.blueprint)
      return None
  
  
  def register_errorhandlers(app):
      """Register error handlers."""
      def render_error(error):
          """Render error template."""
          # If a HTTPException, pull the `code` attribute; default to 500
          error_code = getattr(error, 'code', 500)
          return render_template('{0}.html'.format(error_code)), error_code
      for errcode in [401, 404, 500]:
          app.errorhandler(errcode)(render_error)
      return None
  
  
  def register_shellcontext(app):
      """Register shell context objects."""
      def shell_context():
          """Shell context objects."""
          return {
              'db': db,
              'User': user.models.User}
  
      app.shell_context_processor(shell_context)
  
  
  def register_commands(app):
      """Register Click commands."""
      app.cli.add_command(commands.test)
      app.cli.add_command(commands.lint)
      app.cli.add_command(commands.clean)
      app.cli.add_command(commands.urls)
  